r - Factor as date to numeric -

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i'm sorry bothering can't find solution this.

i have data.frame column name date: 

 str(df$date)  factor w/ 360 levels "1982-11-30","1982-12-31",..: 1 4 7 10 13 16 19 22 25 28 ...   class(a)  [1] "factor"

i convert numeric values: from: "1982-11-30" 19821130 or else.

edit:

initially have had in numeric format , converted factor following: 

date <- as.date(as.character(df$date_num),format="%y%m%d")

so how reverse this?

something this?

dd <- structure(1:2, .label = c("2013-01-01", "2013-02-01"), class = "factor") # [1] 2013-01-01 2013-02-01 # levels: 2013-01-01 2013-02-01  as.numeric(gsub("-", "", as.character(dd), fixed=true)) # [1] 20130101 20130201

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